Let’s go through each problem one by one. We’ll use simple math and clear steps.
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Problem 1:
What volume is required for an injection if 500mg are ordered and stock ampules contain 250mg/ml?
→ You need 500mg.
→ Each ml has 250mg.
→ So, how many ml do you need?
Divide: 500 ÷ 250 = 2 ml.
✔ Answer:
2 ml
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Problem 2:
What volume is required for an injection if 600mg are ordered and stock ampules contain 350mg/ml?
→ You need 600mg.
→ Each ml has 350mg.
→ Divide: 600 ÷ 350 = ?
Let’s calculate:
600 ÷ 350 = 1.714... ≈
1.71 ml (rounded to two decimal places)
✔ Answer:
1.71 ml
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Problem 3:
What volume is required for an injection if 750mg are ordered and stock ampules contain 200mg/ml?
→ Need 750mg.
→ Each ml has 200mg.
→ Divide: 750 ÷ 200 = 3.75 ml
✔ Answer:
3.75 ml
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Problem 4:
A dose of 2g of medication has been ordered. The medication comes in 4g/0.4mL. What volume will you give?
→ First, note: 2g is half of 4g.
→ If 4g is in 0.4mL, then 2g is in half of that → 0.2mL.
Or using formula:
Volume = (Ordered Dose / Stock Dose) × Volume of Stock
= (2g / 4g) × 0.4mL = 0.5 × 0.4 = 0.2mL
✔ Answer:
0.2 mL
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Problem 5:
A dose of 4500mg of medication has been ordered. The medication comes in 5g/0.3mL. What volume will you give?
→ First, convert units! 4500mg = 4.5g (since 1000mg = 1g)
→ Stock is 5g per 0.3mL
→ So, Volume = (4.5g / 5g) × 0.3mL = 0.9 × 0.3 = 0.27mL
✔ Answer:
0.27 mL
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Problem 6:
A dose of 3500mg of medication has been ordered. The medication comes in 5g/2mL. What volume will you give?
→ Convert 3500mg to grams: 3.5g
→ Stock: 5g in 2mL
→ Volume = (3.5g / 5g) × 2mL = 0.7 × 2 = 1.4mL
✔ Answer:
1.4 mL
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Problem 7:
A flask of 1.5L of 0.9% saline is required over 8hrs with a DF of 20. How many DPM is this?
→ DPM = Drops Per Minute
→ Formula: DPM = (Total Volume in mL × Drop Factor) ÷ Time in minutes
First, convert 1.5L to mL → 1.5 × 1000 = 1500 mL
Time = 8 hours → 8 × 60 = 480 minutes
Drop Factor (DF) = 20 drops/mL
So:
DPM = (1500 × 20) ÷ 480
= 30,000 ÷ 480
= 62.5
✔ Answer:
62.5 DPM
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Problem 8:
A flask of 1L of 4% dextrose in saline is required over 6hrs with a DF of 15. How many DPM is this?
→ 1L = 1000 mL
→ Time = 6 hours = 6 × 60 = 360 minutes
→ DF = 15
DPM = (1000 × 15) ÷ 360
= 15,000 ÷ 360
= 41.666... ≈
41.67 DPM (rounded to two decimals)
✔ Answer:
41.67 DPM
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Final Answer:
1. 2 ml
2. 1.71 ml
3. 3.75 ml
4. 0.2 mL
5. 0.27 mL
6. 1.4 mL
7. 62.5 DPM
8. 41.67 DPM
Parent Tip: Review the logic above to help your child master the concept of nursing dosage calculation practice worksheets with answers pdf.
